Finding the Fourth Proportional to 300,211.30, 450,371.52 and 142,438.27

Step by Step Solution

1. Step 1: Write the proportion equation
   300,211.30 : 450,371.52 = 142,438.27 : x
2. Step 2: Convert to fraction form
   300,211.30/450,371.52 = 142,438.27/x
3. Step 3: Cross multiply
   300,211.30x = 450,371.52 × 142,438.27
4. Step 4: Simplify right side
   300,211.30x = 64,150,140,166.07
5. Step 5: Solve for x
   x = 64,150,140,166.07/300,211.30
6. Step 6: Final answer
   x = 213,683.30